In message <43BBA5E5.9050809@gmail.com> Regulus Berdin wrote: > You only need 6 resistors, 2 for each backplanes if LCD is driven 1/2 > bias. Segments are driven either fully 1 or 0 so no need to 1/2 bias > them. See attached timing diagram. That's a pretty neat way to do it. Only problem is, the display won't run in SLEEP mode so I'm not going to be able to get the power consumption down far enough to run it for long periods off a lithium coin cell. Still a neat idea, though, and it might be worth a try... So for three backplanes, the BP signals would look something like this: __ | | 1 BP1 --+ +---------+ +-------- 1/2 |__| 0 __ | | 1 BP2 -----+ +---------+ +----- 1/2 |__| 0 __ | | 1 BP3 --------+ +---------+ +-- 1/2 |__| 0 In other words, 1/2 bias drive with 1/3 multiplexing. Time for an experiment - just as soon as I find some of those zebra-strip connectors that actually work... Thanks. -- Phil. | Acorn RiscPC600 SA220 64MB+6GB 100baseT philpem@dsl.pipex.com | Athlon64 3200+ A8VDeluxe R2 512MB+100GB http://www.philpem.me.uk/ | Panasonic CF-25 Mk.2 Toughbook ... Another nearly-full box of Smarties!! -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist